Large-temperature-difference centralized heat supply system adopting double condensers

Abstract

The invention relates to a large-temperature-difference centralized heat supply system adopting double condensers. The system device is composed of a steam turbine, an absorption heat pump, a first-stage condenser, a second-stage condenser, a steam-water heat exchanger, a large-temperature-difference heat exchange system, various water pumps and pipelines. A double-condenser series structure is adopted, exhaust steam waste heat is absorbed by the first-stage condenser, and the absorption heat pump, the steam-water heat exchanger and the large-temperature-difference heat exchange system are used for applying the absorbed exhaust steam waste heat to urban heating; the first-stage condenser is limited by actual working conditions, and all the exhaust steam cannot be cooled and condensed; andfor the purpose of ensuring the power generation efficiency of a power plant, the two-stage condenser is adopted to cool the residual steam passing through the first-stage condenser, and the second-stage condenser adopts river, lake and sea water as cooling water. The double-condenser structure not only realizes efficient recovery of the exhaust steam waste heat, but also is used for isolating thecooled river, lake and sea water from the absorption heat pump system, and prevents the absorption heat pump and other system equipment from being corroded by the river, lake and sea water.

Description

technical field [0001] The invention belongs to the field of improving energy utilization efficiency, and relates to a central heating system with large temperature difference, which adopts two sets of condenser structures, and can effectively recover exhausted steam and waste heat discharged by steam turbines in power plants. Background technique [0002] With the continuous growth of urban area, urban heating demand is also increasing. In combined heat and power generation, the loss at the cold end is the largest loss in the thermal system of the power plant. The loss of steam exhaust from the steam turbine and the heat loss from the exhaust smoke of the boiler are both waste heat emissions for thermal power plants, and constitute a huge waste of energy for building heating. . If the exhaust heat of the steam turbine can be recovered for urban heating, the heating capacity and energy utilization efficiency of the power plant will be greatly improved. [0003] In coastal ...

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Problems solved by technology

At the same time, the exhaust steam discharged from the steam turbine contains a large amount of latent heat of vaporization, which cannot be fully recovered by the absorption heat pump. This invention provides a set of waste heat recovery coupled with a large temperature difference heating system using a double condenser structure.

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